Personal and professional papers, including biographical material and family history, official correspondence 1927 to 1932, personal and professional correspondence 1932 to 1972, diaries 1913 to 1971, manuscripts, public lectures, radio scripts, reports, reprints, files relating to his service with UNRAA and United Nations, photographs. Interests include the Royal Historical Society of Queensland, National Trust of Australia and Australian League of Rights. Includes photographs of New Guinea from 1920s; also some papers relating to Sister Elizabeth Kenny, and indigenous people of north Queensland.

Photocopy of typescript draft of "Coconuts and tearooms: six years in New Britain, New Guinea in the 1930's : the Colonial days"(Auckland, N.Z.: The author, 1993.) Accompanied by photocopies of photographs, some used in the publication, and a listing of captions.

Bound album of black and white photographs. Appears to be a record of Appel's voyage while Home Secretary in the Queensland Government Steamer "Otter" in 1914 which went as far north as Daru on the coast of south-western Papua.

Photographs without text.